Dislocation Motion in Metals Overview

These flashcards cover key vocabulary and concepts related to dislocation motion and deformation mechanisms in metals, based on lecture notes from Chapter 7.

Slip System

A combination of a slip plane and a slip direction where dislocation motion occurs.

Slip Plane

The plane on which the easiest slippage of dislocations occurs, characterized by highest planar densities.

Edge Dislocation

A dislocation where an extra half-plane of atoms is present, allowing slip over adjacent atomic planes.

Shear Stress

The stress component acting parallel to the slip plane; critical for dislocation movement.

FCC

Face-Centered Cubic structure; a type of crystal structure where slip occurs on {111} planes in

BCC

Body-Centered Cubic structure; another type of crystal structure with distinct slip systems.

Slip Direction

The direction along which dislocation moves; typically aligned with the Burgers vector.

Anisotropy

Variation in properties of a material in different directions, often due to grain orientation in polycrystalline materials.

Hall-Petch Equation

Describes the relationship between yield strength and grain size; indicates that smaller grains increase strength.

Cold Work

Deformation at room temperature that increases dislocation density and thus strength of metals.

Heat Treatment

Process involving recovery, recrystallization, and grain growth to manipulate dislocation density and grain size.

Precipitation Strengthening

Strengthening technique that involves the formation of hard particles that hinder dislocation motion.